Add socat-at-bridge ipk source

ipk-source/socat-at-bridge/root/etc/init.d/socat-at-bridge

@@ -0,0 +1,40 @@
+#!/bin/sh /etc/rc.common
+
+START=99
+STOP=10
+
+USE_PROCD=1
+
+start_service() {
+    procd_open_instance
+
+    # Start socat to create /dev/ttyIN and /dev/ttyOUT
+    procd_set_param command \
+        socat -d -d pty,link=/dev/ttySMD11IN,raw,echo=0,group=20,perm=660 \
+                 pty,link=/dev/ttySMD11,raw,echo=1,group=20,perm=660
+    procd_set_param respawn
+    procd_set_param stdout 1
+    procd_set_param stderr 1
+    procd_close_instance
+
+    # Start cat process for /dev/smd11 to /dev/ttySMD11IN
+    procd_open_instance
+    procd_set_param command sh -c "cat /dev/smd11 > /dev/ttySMD11IN"
+    procd_set_param respawn
+    procd_set_param stdout 1
+    procd_set_param stderr 1
+    procd_close_instance
+
+    # Start cat process for /dev/ttySMD11IN to /dev/smd11
+    procd_open_instance
+    procd_set_param command sh -c "cat /dev/ttySMD11IN > /dev/smd11"
+    procd_set_param respawn
+    procd_set_param stdout 1
+    procd_set_param stderr 1
+    procd_close_instance
+}
+
+stop_service() {
+    # procd will handle stopping all instances automatically
+    echo "Stopping socat and cat instances."
+}